LONGITUDINAL CONTROL SYSTEM FOR HIGH-SPEED AIRCRAFT 480181
A SET of feeler elevators or “feelevators” added to regular spring-tab elevators can lessen the effect of airspeed on the ratio of stick force to airplane normal acceleration.
The author develops an equation for computing the stick force per g of normal acceleration with a spring-tab and feelevator arrangement, and applies the equation to a large, high-speed fighter. Plotted results show that, with the feelevator, the stick force required at high speeds to move the elevator is great enough so that the pilot will not accidentally set the elevators for dangerously large accelerations. Yet at low speeds, a reasonably small stick force is enough to control the elevators.